JP2023073499A - secondary battery - Google Patents

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JP2023073499A
JP2023073499A JP2023059981A JP2023059981A JP2023073499A JP 2023073499 A JP2023073499 A JP 2023073499A JP 2023059981 A JP2023059981 A JP 2023059981A JP 2023059981 A JP2023059981 A JP 2023059981A JP 2023073499 A JP2023073499 A JP 2023073499A
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electrode
positive electrode
electrode body
current collector
plate
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JP7509946B2 (en
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信二 戸井
Shinji Toi
太貴 野中
Taiki Nonaka
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Sanyo Electric Co Ltd
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    • H—ELECTRICITY
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    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
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    • H01M10/0468—Compression means for stacks of electrodes and separators
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    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
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    • H—ELECTRICITY
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    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/668—Composites of electroconductive material and synthetic resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
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    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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  • Manufacturing & Machinery (AREA)
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Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery with high reliability, in which a short-circuiting between a positive electrode plate and a negative electrode plate is suppressed.
SOLUTION: A secondary battery includes a rectangular package 1 including an opening and housing a first electrode body 3a and a second electrode body 3b, a sealing plate 2 for sealing the opening of the rectangular package 1, and a positive electrode current collector. The sealing plate 2 includes an electrolyte solution injection hole 15. The first electrode body 3a includes a first insulating sheet on an outermost surface on the second electrode body 3b side. The second electrode body 3b includes a second insulating sheet on an outermost surface on the first electrode body 3a side. A first tape 80a is pasted across the first insulating sheet and an outermost surface of a first positive electrode tab group 40a. A second tape 80b is pasted across the second insulating sheet and an outermost surface of a second positive electrode tab group 40b. At least one of the first tape 80a and the second tape 80b is disposed at a position facing the electrolyte solution injection hole 15.
SELECTED DRAWING: Figure 9
COPYRIGHT: (C)2023,JPO&INPIT

Description

本開示は二次電池に関する。 The present disclosure relates to secondary batteries.

電気自動車（ＥＶ）やハイブリッド電気自動車（ＨＥＶ、ＰＨＥＶ）等の駆動用電源において、アルカリ二次電池や非水電解質二次電池等の二次電池が使用されている。 Secondary batteries such as alkaline secondary batteries and non-aqueous electrolyte secondary batteries are used in power sources for driving electric vehicles (EV), hybrid electric vehicles (HEV, PHEV) and the like.

これらの二次電池では、開口を有する有底筒状の外装体と、その開口を封口する封口板により電池ケースが構成される。電池ケース内には、正極板、負極板及びセパレータからなる電極体が電解質と共に収容される。封口板には正極端子及び負極端子が取り付けられる。正極端子は正極集電体を介して正極板に電気的に接続され、負極端子は負極集電体を介して負極板に電気的に接続される。 In these secondary batteries, a battery case is composed of a bottomed cylindrical exterior body having an opening and a sealing plate that seals the opening. An electrode body consisting of a positive electrode plate, a negative electrode plate and a separator is housed in the battery case together with an electrolyte. A positive terminal and a negative terminal are attached to the sealing plate. The positive terminal is electrically connected to the positive plate through the positive current collector, and the negative terminal is electrically connected to the negative plate through the negative current collector.

このような二次電池においては、封口板に電解液注液孔が形成されており、電解液注液孔から電池ケース内に電解液が注入され、その後、電解液注液孔が封止部材により封止される（下記特許文献１）。 In such a secondary battery, an electrolyte injection hole is formed in the sealing plate, and the electrolyte is injected into the battery case through the electrolyte injection hole. (Patent Document 1 below).

特開２０１８－２９００６号公報Japanese Patent Application Laid-Open No. 2018-29006

本開示は、正極板と負極板の短絡が抑制された信頼性の高い二次電池を提供することを一つの目的とする。 An object of the present disclosure is to provide a highly reliable secondary battery in which a short circuit between a positive electrode plate and a negative electrode plate is suppressed.

本開示の一形態に係る二次電池は、
正極板と負極板を含む第１電極体と、
正極板と負極板を含む第２電極体と、
開口を有し、前記第１電極体と前記第２電極体を収容する外装体と、
前記開口を封口する封口板と、
前記第１電極体及び前記第２電極体よりも前記封口板側に配置された集電体と、
前記集電体に電気的に接続され、前記封口板に取り付けられた端子と、を備える二次電池であって、
前記封口板は電解液注液孔を有し、
前記第１電極体は前記第２電極体側の最外面に第１絶縁シートを有し、
前記第２電極体は前記第１電極体側の最外面に第２絶縁シートを有し、
前記第１電極体は、前記封口板側の端部に、前記正極板又は前記負極板に電気的に接続された第１電極タブ群を有し、
前記第２電極体は、前記封口板側の端部に、前記正極板又は前記負極板に電気的に接続された第２電極タブ群を有し、
前記第１電極タブ群と前記第２電極タブ群は、前記集電体に接続され、
前記第１タブ群の最外面と前記第１絶縁シートに跨って第１テープが貼り付けられており、
前記第２タブ群の最外面と前記第２絶縁シートに跨って第２テープが貼り付けられており、
前記電解液注液孔と対向する位置に、前記第１テープ及び前記第２テープの少なくとも一方が配置され、
前記電解液注液孔は封止部材により封止部材により封止されている。 A secondary battery according to one embodiment of the present disclosure includes
a first electrode body including a positive plate and a negative plate;
a second electrode body including a positive plate and a negative plate;
an exterior body having an opening and accommodating the first electrode body and the second electrode body;
a sealing plate that seals the opening;
a current collector disposed closer to the sealing plate than the first electrode body and the second electrode body;
a terminal electrically connected to the current collector and attached to the sealing plate,
The sealing plate has an electrolyte injection hole,
The first electrode body has a first insulating sheet on the outermost surface on the side of the second electrode body,
The second electrode body has a second insulating sheet on the outermost surface on the first electrode body side,
The first electrode body has a first electrode tab group electrically connected to the positive electrode plate or the negative electrode plate at the end on the sealing plate side,
The second electrode body has a second electrode tab group electrically connected to the positive electrode plate or the negative electrode plate at the end on the sealing plate side,
The first electrode tab group and the second electrode tab group are connected to the current collector,
A first tape is attached across the outermost surface of the first tab group and the first insulating sheet,
A second tape is attached across the outermost surface of the second tab group and the second insulating sheet,
At least one of the first tape and the second tape is arranged at a position facing the electrolyte injection hole,
The electrolyte injection hole is sealed by a sealing member.

電極体が、正極板の端部、セパレータの端部、及び負極板の端部が配置された積層端部を有し、この積層端部が封口板側に配置された二次電池においては、封口板に設けられた電解液注液孔から電解液を注入した際に、セパレータが捲れる可能性がある。そして、セパレータが捲れた場合、隣接する正極板と負極板が接触することで短絡が生じる虞がある。また、正極活物質層ないし負極活物質層の一部が脱落し、短絡の原因となる虞がある。 In a secondary battery in which the electrode body has a laminated end portion in which an end portion of the positive electrode plate, an end portion of the separator, and an end portion of the negative electrode plate are arranged, and the laminated end portion is arranged on the side of the sealing plate, There is a possibility that the separator will turn over when the electrolyte is injected through the electrolyte injection hole provided in the sealing plate. If the separator is curled, the adjacent positive electrode plate and negative electrode plate may come into contact with each other, causing a short circuit. Moreover, part of the positive electrode active material layer or the negative electrode active material layer may come off, causing a short circuit.

本開示の一形態に係る二次電池の構成によると、封口板に設けられた電解液注液孔から電解液を注入したときに、セパレータが捲れることを効果的に抑制できる。よって、正極板と負極板の短絡がより効果的に抑制できる。 According to the configuration of the secondary battery according to one embodiment of the present disclosure, it is possible to effectively suppress curling of the separator when the electrolyte is injected through the electrolyte injection hole provided in the sealing plate. Therefore, a short circuit between the positive electrode plate and the negative electrode plate can be more effectively suppressed.

本開示によると、電池ケースに設けられた電解液注液孔から電解液を電池ケース内に注入したとき、セパレータの捲れが生じることが抑制される。よって、正極板と負極板の短絡が抑制された信頼性の高い二次電池を提供することができる。 Advantageous Effects of Invention According to the present disclosure, when electrolyte is injected into a battery case through an electrolyte injection hole provided in the battery case, curling of the separator is suppressed. Therefore, it is possible to provide a highly reliable secondary battery in which short-circuiting between the positive electrode plate and the negative electrode plate is suppressed.

実施形態に係る角形二次電池の斜視図である。1 is a perspective view of a prismatic secondary battery according to an embodiment; FIG. 図１におけるＩＩ－ＩＩ線に沿った角形二次電池の断面図である。FIG. 2 is a cross-sectional view of the prismatic secondary battery taken along line II-II in FIG. 1; （ａ）は実施形態に係る正極板の平面図である。（ｂ）は実施形態に係る負極板の平面図である。(a) is a plan view of a positive electrode plate according to an embodiment. (b) is a plan view of a negative electrode plate according to the embodiment. 実施形態に係る電極体の平面図である。4 is a plan view of an electrode assembly according to the embodiment; FIG. 第２正極集電体に正極タブ群を接続し、第２負極集電体に負極タブ群を接続した状態を示す図である。FIG. 4 is a diagram showing a state in which a positive electrode tab group is connected to a second positive electrode current collector, and a negative electrode tab group is connected to a second negative electrode current collector; （ａ）は第１電極体の最外面と第１正極タブ群の近傍の拡大断面図である。（ｂ）は第２電極体の最外面と第２正極タブ群の近傍の拡大断面図である。(a) is an enlarged cross-sectional view of the outermost surface of the first electrode body and the vicinity of the first positive electrode tab group. (b) is an enlarged cross-sectional view of the outermost surface of the second electrode body and the vicinity of the second positive electrode tab group. 第１正極集電体及び第１負極集電体を取り付けた後の封口板の電極体側の面を示す図である。FIG. 4 is a view showing the surface of the sealing plate on the side of the electrode body after the first positive electrode current collector and the first negative electrode current collector are attached; 第１正極集電体に第２正極集電体を取り付け、第１負極集電体に第２負極集電体を取り付けた後の封口板の電極体側の面を示す図である。FIG. 4 is a view showing the surface of the sealing plate on the electrode body side after attaching the second positive electrode current collector to the first positive electrode current collector and attaching the second negative electrode current collector to the first negative electrode current collector; 封口板２の短手方向に沿った断面図であり、電解液注液孔近傍の断面図である。FIG. 2 is a cross-sectional view along the lateral direction of the sealing plate 2, and is a cross-sectional view near the electrolyte injection hole.

実施形態に係る二次電池としての角形二次電池２０の構成を以下に説明する。なお、本発明は、以下の実施形態に限定されない。 A configuration of a prismatic secondary battery 20 as a secondary battery according to an embodiment will be described below. In addition, this invention is not limited to the following embodiment.

図１及び図２に示すように角形二次電池２０は、開口を有する有底角筒状の角形外装体１と、角形外装体１の開口を封口する封口板２からなる電池ケース１００を備える。角形外装体１及び封口板２は、それぞれ金属製であることが好ましい。角形外装体１内には、正極板と負極板を含む電極体３が電解質と共に収容されている。 As shown in FIGS. 1 and 2, a prismatic secondary battery 20 includes a battery case 100 composed of a bottomed rectangular tubular prismatic exterior body 1 having an opening and a sealing plate 2 for sealing the opening of the prismatic exterior body 1 . . It is preferable that each of the rectangular exterior body 1 and the sealing plate 2 is made of metal. An electrode body 3 including a positive electrode plate and a negative electrode plate is housed in the rectangular outer body 1 together with an electrolyte.

電極体３の封口板２側の端部には、複数の正極タブ４ｄからなる正極タブ群４０と、複数の負極タブ５ｃからなる負極タブ群５０が設けられている。正極タブ群４０は第２正極集電体６ｂ及び第１正極集電体６ａを介して正極端子７に電気的に接続されている。負極タブ群５０は第２負極集電体８ｂ及び第１負極集電体８ａを介して負極端子９に電気的に接続されている。第１正極集電体６ａと第２正極集電体６ｂが正極集電体６を構成している。なお、正極集電体６は一つの部品としてもよい。第１負極集電体８ａと第２負極集電体８ｂが負極集電体８を構成している。なお、負極集電体８は一つの部品としてもよい。 A positive electrode tab group 40 including a plurality of positive electrode tabs 4d and a negative electrode tab group 50 including a plurality of negative electrode tabs 5c are provided at the end of the electrode body 3 on the sealing plate 2 side. The positive electrode tab group 40 is electrically connected to the positive terminal 7 via the second positive current collector 6b and the first positive current collector 6a. The negative electrode tab group 50 is electrically connected to the negative terminal 9 via the second negative current collector 8b and the first negative current collector 8a. The positive electrode current collector 6 is composed of the first positive electrode current collector 6 a and the second positive electrode current collector 6 b. Note that the positive electrode current collector 6 may be a single component. The negative electrode current collector 8 is composed of the first negative electrode current collector 8a and the second negative electrode current collector 8b. Note that the negative electrode current collector 8 may be a single component.

第１正極集電体６ａ、第２正極集電体６ｂ及び正極端子７は金属製であることが好ましく、アルミニウム又はアルミニウム合金製であることがより好ましい。正極端子７と封口板２の間には樹脂製の外部側絶縁部材１０が配置されている。第１正極集電体６ａ及び第２正極集電体６ｂと封口板２の間には樹脂製の内部側絶縁部材１１が配置されている。 The first positive electrode current collector 6a, the second positive electrode current collector 6b, and the positive electrode terminal 7 are preferably made of metal, and more preferably made of aluminum or an aluminum alloy. An external insulating member 10 made of resin is arranged between the positive electrode terminal 7 and the sealing plate 2 . Between the sealing plate 2 and the first positive electrode current collector 6a and the second positive electrode current collector 6b, an inner insulating member 11 made of resin is arranged.

第１負極集電体８ａ、第２負極集電体８ｂ及び負極端子９は金属製であることが好ましく、銅又は銅合金製であることがより好ましい。また、負極端子９は、アルミニウム又はアルミニウム合金からなる部分と、銅又は銅合金からなる部分を有するようにすることが好ましい。この場合、銅又は銅合金からなる部分を第１負極集電体８ａに接続し、アルミニウム又はアルミニウム合金からなる部分を封口板２よりも外部側に突出するようにすることが好ましい。負極端子９と封口板２の間には樹脂製の外部側絶縁部材１２が配置されている。第１負極集電体８ａ及び第２負極集電体８ｂと封口板２の間には樹脂製の内部側絶縁部材１３が配置されている。 The first negative electrode current collector 8a, the second negative electrode current collector 8b, and the negative electrode terminal 9 are preferably made of metal, and more preferably made of copper or a copper alloy. Moreover, the negative electrode terminal 9 preferably has a portion made of aluminum or an aluminum alloy and a portion made of copper or a copper alloy. In this case, it is preferable that the portion made of copper or a copper alloy is connected to the first negative electrode current collector 8 a and the portion made of aluminum or an aluminum alloy protrudes outward from the sealing plate 2 . An external insulating member 12 made of resin is arranged between the negative electrode terminal 9 and the sealing plate 2 . Between the sealing plate 2 and the first negative electrode current collector 8a and the second negative electrode current collector 8b, an inner insulating member 13 made of resin is arranged.

電極体３と角形外装体１の間には樹脂製の絶縁シートからなる電極体ホルダー１４が配置されている。電極体ホルダー１４は、樹脂製の絶縁シートを袋状又は箱状に折り曲げ成形されたものであることが好ましい。封口板２には電解液注液孔１５が設けられており、電解液注液孔１５は封止部材１６で封止されている。封止部材１６としてブラインドリベットを用いることができる。また、金属製の封止部材１６を封口板２に溶接接続してもよい。封口板２には、電池ケース１００内の圧力が所定値以上となったときに破断し電池ケース１００内のガスを電池ケース１００外に排出するガス排出弁１７が設けられている。 An electrode body holder 14 made of a resin insulating sheet is arranged between the electrode body 3 and the square outer body 1 . The electrode body holder 14 is preferably formed by bending a resin insulating sheet into a bag-like or box-like shape. The sealing plate 2 is provided with an electrolyte injection hole 15 , and the electrolyte injection hole 15 is sealed with a sealing member 16 . A blind rivet can be used as the sealing member 16 . Alternatively, the metal sealing member 16 may be welded to the sealing plate 2 . The sealing plate 2 is provided with a gas exhaust valve 17 that breaks when the pressure inside the battery case 100 reaches a predetermined value or more to exhaust the gas inside the battery case 100 to the outside of the battery case 100 .

次に角形二次電池２０の製造方法及び各構成の詳細を説明する。 Next, a method for manufacturing the prismatic secondary battery 20 and details of each configuration will be described.

［正極板］
まず、正極板の製造方法を説明する。
［正極活物質層スラリーの作製］
正極活物質としてのリチウムニッケルコバルトマンガン複合酸化物、結着材としてのポリフッ化ビニリデン（ＰＶｄＦ）、導電材としての炭素材料、及び分散媒としてのＮ－メチル－２－ピロリドン（ＮＭＰ）をリチウムニッケルコバルトマンガン複合酸化物：ＰＶｄＦ：炭素材料の質量比が９７．５：１：１．５となるように混練し、正極活物質層スラリーを作製する。 [Positive plate]
First, a method for manufacturing a positive electrode plate will be described.
[Preparation of positive electrode active material layer slurry]
Lithium nickel cobalt manganese composite oxide as a positive electrode active material, polyvinylidene fluoride (PVdF) as a binder, a carbon material as a conductive material, and N-methyl-2-pyrrolidone (NMP) as a dispersion medium. Cobalt-manganese composite oxide:PVdF:carbon material are kneaded at a mass ratio of 97.5:1:1.5 to prepare a positive electrode active material layer slurry.

［正極保護層スラリーの作製］
アルミナ粉末、導電材としての炭素材料、結着材としてのポリフッ化ビニリデン（ＰＶｄＦ）と分散媒としてのＮ－メチル－２－ピロリドン（ＮＭＰ）を、アルミナ粉末：炭素材料：ＰＶｄＦの質量比が８３：３：１４となるように混練し、保護層スラリーを作製する。 [Preparation of positive electrode protective layer slurry]
Alumina powder, a carbon material as a conductive material, polyvinylidene fluoride (PVdF) as a binder, N-methyl-2-pyrrolidone (NMP) as a dispersion medium, and a mass ratio of alumina powder: carbon material: PVdF of 83 : 3:14 to prepare a protective layer slurry.

［正極活物質層及び正極保護層の形成］
正極芯体としての厚さ１５μｍのアルミニウム箔の両面に、上述の方法で作製した正極活物質層スラリー及び正極保護層スラリーをダイコータにより塗布する。このとき、正極保護層スラリーは、正極芯体における正極活物質層スラリーの塗布部の端部近傍に塗布する。 [Formation of positive electrode active material layer and positive electrode protective layer]
The positive electrode active material layer slurry and the positive electrode protective layer slurry prepared by the method described above are applied to both surfaces of a 15 μm thick aluminum foil as a positive electrode core using a die coater. At this time, the positive electrode protective layer slurry is applied to the vicinity of the end of the positive electrode active material layer slurry-applied portion of the positive electrode substrate.

正極活物質層スラリー及び正極保護層スラリーが塗布された正極芯体を乾燥させ、正極活物質層スラリー及び正極保護層スラリーに含まれるＮＭＰを除去する。これにより正極活物質層及び保護層が形成される。その後、一対のプレスローラの間を通過させることにより、正極活物質層を圧縮して正極原板とする。正極原板を所定の形状に切断することにより正極板４とする。 The positive electrode substrate coated with the positive electrode active material layer slurry and the positive electrode protective layer slurry is dried to remove NMP contained in the positive electrode active material layer slurry and the positive electrode protective layer slurry. Thus, a positive electrode active material layer and a protective layer are formed. After that, by passing between a pair of press rollers, the positive electrode active material layer is compressed to form a positive electrode original plate. A positive electrode plate 4 is formed by cutting a positive electrode original plate into a predetermined shape.

図３（ａ）は、正極板４の平面図である。正極板４は、正極芯体４ａとしてのアルミニウム箔の両面に、正極活物質層４ｂが形成されている。正極板４の一つの端辺に、正極芯体４ａの両面に正極活物質層４ｂが形成されていない正極芯体露出部が正極タブ４ｄとして設けられている。また、正極板４において正極タブ４ｄが設けられた端辺の近傍と、正極タブ４ｄの根元近傍においては、正極芯体４ａの両面に正極保護層４ｃが形成されている。 FIG. 3(a) is a plan view of the positive electrode plate 4. FIG. The positive electrode plate 4 has positive electrode active material layers 4b formed on both sides of an aluminum foil serving as a positive electrode core 4a. At one edge of the positive electrode plate 4, a positive electrode core exposed portion where the positive electrode active material layer 4b is not formed on both surfaces of the positive electrode core 4a is provided as a positive electrode tab 4d. Further, in the vicinity of the edge of the positive electrode plate 4 where the positive electrode tab 4d is provided and in the vicinity of the base of the positive electrode tab 4d, the positive electrode protective layer 4c is formed on both surfaces of the positive electrode core 4a.

［負極板］
次に、負極板の製造方法を説明する。
［負極活物質層スラリーの作製］
負極活物質としての黒鉛、結着材としてのスチレンブタジエンゴム（ＳＢＲ）及びカルボキシメチルセルロース（ＣＭＣ）、及び分散媒としての水を、黒鉛：ＳＢＲ：ＣＭＣの質量比が９８：１：１となるように混練し、負極活物質層スラリーを作製する。 [Negative plate]
Next, a method for manufacturing a negative electrode plate will be described.
[Preparation of negative electrode active material layer slurry]
Graphite as a negative electrode active material, styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) as binders, and water as a dispersion medium were added so that the mass ratio of graphite:SBR:CMC was 98:1:1. to prepare a negative electrode active material layer slurry.

［負極活物質層の形成］
負極芯体としての厚さ８μｍの銅箔の両面に、上述の方法で作製した負極活物質層スラリーをダイコータにより塗布する。 [Formation of Negative Electrode Active Material Layer]
The negative electrode active material layer slurry prepared by the method described above is applied to both surfaces of a copper foil having a thickness of 8 μm as a negative electrode core using a die coater.

負極活物質層スラリーが塗布された負極芯体を乾燥させ、負極活物質層スラリーに含まれる水を除去する。これにより負極活物質層が形成される。その後、一対のプレスローラの間を通過させることにより、負極活物質層を圧縮して負極原板とする。負極原板を所定の形状に切断することにより負極板５とする。 The negative electrode substrate coated with the negative electrode active material layer slurry is dried to remove water contained in the negative electrode active material layer slurry. Thus, a negative electrode active material layer is formed. After that, by passing between a pair of press rollers, the negative electrode active material layer is compressed to form a negative electrode original plate. A negative electrode plate 5 is formed by cutting the negative electrode original plate into a predetermined shape.

図３（ｂ）は、負極板５の平面図である。負極板５は、負極芯体５ａとしての銅箔の両面に、負極活物質層５ｂが形成されている。負極板５の一つの端辺に、負極芯体５ａの両面に負極活物質層５ｂが形成されていない負極芯体露出部が負極タブ５ｃとして設けられている。 FIG. 3(b) is a plan view of the negative electrode plate 5. FIG. The negative electrode plate 5 has negative electrode active material layers 5b formed on both sides of a copper foil serving as a negative electrode core 5a. At one edge of the negative electrode plate 5, a negative electrode substrate exposed portion where the negative electrode active material layer 5b is not formed on both surfaces of the negative electrode substrate 5a is provided as a negative electrode tab 5c.

［電極体の作製］
上述の方法で作製した正極板４及び負極板５を、ポリオレフィン製の矩形状のセパレータ９０を介して積層し、積層型の電極体３を製造する。図４は、電極体３の平面図である。電極体３は、端部に、各正極板４に設けられた正極タブ４ｄが積層された正極タブ群４０を有する。また、電極体３は、端部に、各負極板５に設けられた負極タブ５ｃが積層された負極タブ群５０を有する。電極体３は偏平状である。なお、正極板４、セパレータ９０、及び負極板５の積層方向において、電極体３の両外面にはセパレータ９０が配置されている。 [Fabrication of electrode body]
The positive electrode plate 4 and the negative electrode plate 5 produced by the above-described method are laminated via a rectangular separator 90 made of polyolefin to manufacture the laminated electrode body 3 . FIG. 4 is a plan view of the electrode assembly 3. FIG. The electrode assembly 3 has, at its end, a positive electrode tab group 40 in which the positive electrode tabs 4d provided on the positive electrode plates 4 are laminated. Moreover, the electrode body 3 has a negative electrode tab group 50 in which the negative electrode tabs 5c provided on each of the negative electrode plates 5 are laminated at the end portion. The electrode body 3 is flat. Separators 90 are arranged on both outer surfaces of the electrode body 3 in the stacking direction of the positive electrode plate 4 , the separators 90 , and the negative electrode plate 5 .

なお、電極体３に含まれるセパレータとして、矩形状の複数枚のセパレータを用いてもよいし、帯状のセパレータを九十九折状として用いてもよい。また、電極体３内において、帯状のセパレータが巻回されてもよい。また、セパレータは、ポリオレフィン製の基材の表面に耐熱層を有するものであってもよい。耐熱層はセラミック等の無機粒子とバインダーを含む層である。また、セパレータの表面に接着層が形成され、当該接着層によりセパレータと正極板４及び負極板５の少なくとも一方が接着されていてもよい。 As the separators included in the electrode body 3, a plurality of rectangular separators may be used, or strip-shaped separators may be folded in a zigzag pattern. Further, a strip-shaped separator may be wound inside the electrode body 3 . Moreover, the separator may have a heat-resistant layer on the surface of the base material made of polyolefin. The heat-resistant layer is a layer containing inorganic particles such as ceramics and a binder. Further, an adhesive layer may be formed on the surface of the separator, and the separator and at least one of the positive electrode plate 4 and the negative electrode plate 5 may be bonded by the adhesive layer.

一つの電極体３において正極板の積層数は特に限定されないが、１０～１００層であることが好ましく、３０～８０層であることがより好ましい。一つの電極体３における負極板の積層数を正極板の積層数よりも一層多くし、全ての正極板の両面が負極板と対向するようにすることが好ましい。 Although the number of positive electrode plates laminated in one electrode body 3 is not particularly limited, it is preferably 10 to 100 layers, more preferably 30 to 80 layers. It is preferable that the number of laminated negative electrode plates in one electrode body 3 is larger than the number of laminated positive electrode plates so that both surfaces of all the positive electrode plates face the negative electrode plates.

なお、電極体３は、帯状の正極板と帯状の負極板を、帯状のセパレータを介して巻回した偏平状の巻回電極体であってもよい。 The electrode body 3 may be a flat wound electrode body in which a strip-shaped positive electrode plate and a strip-shaped negative electrode plate are wound with a strip-shaped separator interposed therebetween.

［集電体とタブの接続］
上述の方法で２つの電極体３を作製し、それぞれ第１電極体３ａ、第２電極体３ｂとする。第１電極体３ａの正極タブ群４０、負極タブ群５０を、それぞれ第１正極タブ群４０ａ、第１負極タブ群５０ａとする。第２電極体３ｂの正極タブ群４０、負極タブ群５０を、それぞれ第２正極タブ群４０ｂ、第２負極タブ群５０ｂとする。なお、第１電極体３ａと第２電極体３ｂは全く同じ構成であってもよいし、構成が異なっていてもよい。 [Connection of current collector and tab]
Two electrode bodies 3 are produced by the above-described method, and are referred to as a first electrode body 3a and a second electrode body 3b, respectively. The positive electrode tab group 40 and the negative electrode tab group 50 of the first electrode body 3a are referred to as a first positive electrode tab group 40a and a first negative electrode tab group 50a, respectively. The positive electrode tab group 40 and the negative electrode tab group 50 of the second electrode body 3b are referred to as a second positive electrode tab group 40b and a second negative electrode tab group 50b, respectively. The first electrode body 3a and the second electrode body 3b may have exactly the same structure, or may have different structures.

図５に示すように、第１電極体３ａの第１正極タブ群４０ａと、第２電極体３ｂの第２正極タブ群４０ｂとを、第２正極集電体６ｂに接続し、接合部６０を形成する。また、第１電極体３ａの第１負極タブ群５０ａと、第２電極体３ｂの第２負極タブ群５０ｂとを、第２負極集電体８ｂに接続し、接合部６１を形成する。接合方法としては、超音波溶接（超音波接合）、抵抗溶接、レーザー溶接等を用いることができる。 As shown in FIG. 5, the first positive electrode tab group 40a of the first electrode body 3a and the second positive electrode tab group 40b of the second electrode body 3b are connected to the second positive electrode current collector 6b, and the joint portion 60 is connected to the second positive electrode current collector 6b. to form Also, the first negative electrode tab group 50a of the first electrode body 3a and the second negative electrode tab group 50b of the second electrode body 3b are connected to the second negative electrode current collector 8b to form a joint portion 61 . As a bonding method, ultrasonic welding (ultrasonic bonding), resistance welding, laser welding, or the like can be used.

図５及び図６（ａ）に示すように、第１電極体３ａにおける最外面であって、角形二次電池２０となった状態で第２電極体３ｂ側に位置する最外面には、第１絶縁シートとしての第１最外セパレータ９０ａが配置されている。そして、第１最外セパレータ９０ａと第１正極タブ群４０ａを構成する正極タブ４ｄに跨るように第１テープ８０ａが貼り付けられている。なお、第１テープ８０ａの貼り付けは、第１正極タブ群４０ａ及び第２正極タブ群４０ｂを第２正極集電体６ｂに接続する前に行ってもよいし、第１正極タブ群４０ａ及び第２正極タブ群４０ｂを第２正極集電体６ｂに接続した後に行ってもよい。 As shown in FIGS. 5 and 6(a), the outermost surface of the first electrode body 3a, which is located on the side of the second electrode body 3b in the prismatic secondary battery 20, has a second electrode body 3b. A first outermost separator 90a is arranged as one insulating sheet. A first tape 80a is attached so as to straddle the first outermost separator 90a and the positive electrode tabs 4d constituting the first positive electrode tab group 40a. The first tape 80a may be attached before the first positive electrode tab group 40a and the second positive electrode tab group 40b are connected to the second positive electrode current collector 6b. It may be performed after connecting the second positive electrode tab group 40b to the second positive electrode current collector 6b.

図５及び図６（ｂ）に示すように、第２電極体３ｂにおける最外面であって、角形二次電池２０となった状態で第１電極体３ａ側に位置する最外面には、第２絶縁シートとしての第２最外セパレータ９０ｂが配置されている。そして、第２最外セパレータ９０ｂと第２正極タブ群４０ｂを構成する正極タブ４ｄに跨るように第２テープ８０ｂが貼り付けられている。なお、第２テープ８０ｂの貼り付けは、第１負極タブ群５０ａ及び第２負極タブ群５０ｂを第２負極集電体８ｂに接続する前に行ってもよいし、第１負極タブ群５０ａ及び第２負極タブ群５０ｂを第２負極集電体８ｂに接続した後に行ってもよい。 As shown in FIGS. 5 and 6B, the outermost surface of the second electrode body 3b, which is located on the side of the first electrode body 3a in the prismatic secondary battery 20, has a second electrode body 3b. A second outermost separator 90b is arranged as two insulating sheets. A second tape 80b is attached so as to straddle the second outermost separator 90b and the positive electrode tabs 4d constituting the second positive electrode tab group 40b. The second tape 80b may be attached before connecting the first negative electrode tab group 50a and the second negative electrode tab group 50b to the second negative electrode current collector 8b. It may be performed after connecting the second negative electrode tab group 50b to the second negative electrode current collector 8b.

第２正極集電体６ｂには、薄肉部６ｃが形成され、薄肉部６ｃ内には集電体開口６ｄが形成されている。第２正極集電体６ｂには、封口板２の電解液注液孔１５と対向する位置に集電体貫通穴６ｅが形成されている。第２負極集電体８ｂには、薄肉部８ｃが形成され、薄肉部８ｃ内には集電体開口８ｄが形成されている。 A thin portion 6c is formed in the second positive electrode current collector 6b, and a current collector opening 6d is formed in the thin portion 6c. A current collector through-hole 6 e is formed in the second positive electrode current collector 6 b at a position facing the electrolyte injection hole 15 of the sealing plate 2 . A thin portion 8c is formed in the second negative electrode current collector 8b, and a current collector opening 8d is formed in the thin portion 8c.

［封口板への各部品取り付け］
図７は、各部品を取り付けた封口板２の電池内部側の面を示す図である。封口板２への各部品取り付けは次のように行われる。 [Attaching each part to the sealing plate]
FIG. 7 is a view showing the inner side of the battery of the sealing plate 2 to which each component is attached. Each part is attached to the sealing plate 2 as follows.

封口板２の正極端子挿入孔２ａの周囲の電池外面側に外部側絶縁部材１０を配置する。封口板２の正極端子挿入孔２ａの周囲の電池内面側に内部側絶縁部材１１及び第１正極集電体６ａを配置する。そして、正極端子７を電池外部側から、外部側絶縁部材１０の貫通孔、封口板２の正極端子挿入孔２ａ、内部側絶縁部材１１の貫通孔及び第１正極集電体６ａの貫通孔に挿入し、正極端子７の先端を第１正極集電体６ａ上にカシメる。これにより、正極端子７及び第１正極集電体６ａが封口板２に固定される。なお、正極端子７においてカシメられた部分と第１正極集電体６ａを溶接することが好ましい。 An external insulating member 10 is arranged on the battery outer surface side around the positive electrode terminal insertion hole 2 a of the sealing plate 2 . The inner side insulating member 11 and the first positive electrode current collector 6a are arranged on the battery inner surface side around the positive electrode terminal insertion hole 2a of the sealing plate 2 . Then, the positive electrode terminal 7 is inserted from the outside of the battery into the through hole of the outer insulating member 10, the positive electrode terminal insertion hole 2a of the sealing plate 2, the through hole of the inner insulating member 11, and the through hole of the first positive current collector 6a. Then, the tip of the positive terminal 7 is crimped onto the first positive current collector 6a. Thereby, the positive terminal 7 and the first positive current collector 6 a are fixed to the sealing plate 2 . It is preferable to weld the crimped portion of the positive electrode terminal 7 and the first positive electrode current collector 6a.

封口板２の負極端子挿入孔２ｂの周囲の電池外面側に外部側絶縁部材１２を配置する。封口板２の負極端子挿入孔２ｂの周囲の電池内面側に内部側絶縁部材１３及び第１負極集電体８ａを配置する。そして、負極端子９を電池外部側から、外部側絶縁部材１２の貫通孔、封口板２の負極端子挿入孔２ｂ、内部側絶縁部材１３の貫通孔及び第１負極集電体８ａの貫通孔に挿入し、負極端子９の先端を第１負極集電体８ａ上にカシメる。これにより、負極端子９及び第１負極集電体８ａが封口板２に固定される。なお、負極端子９においてカシメられた部分と第１負極集電体８ａを溶接することが好ましい。 An external insulating member 12 is arranged on the battery outer surface side around the negative electrode terminal insertion hole 2 b of the sealing plate 2 . An inner insulating member 13 and a first negative current collector 8a are arranged on the battery inner surface side around the negative electrode terminal insertion hole 2b of the sealing plate 2 . Then, the negative electrode terminal 9 is connected from the outside of the battery to the through hole of the outer insulating member 12, the negative electrode terminal insertion hole 2b of the sealing plate 2, the through hole of the inner insulating member 13, and the through hole of the first negative electrode current collector 8a. Then, the tip of the negative electrode terminal 9 is crimped onto the first negative electrode current collector 8a. Thereby, the negative terminal 9 and the first negative current collector 8 a are fixed to the sealing plate 2 . It is preferable to weld the crimped portion of the negative electrode terminal 9 and the first negative electrode current collector 8a.

内部側絶縁部材１１は、封口板２の電池内面に沿って配置される絶縁部材本体部１１ａを有する。絶縁部材本体部１１ａにおいて、封口板２に設けられた電解液注液孔１５と対向する部分には、絶縁部材開口１１ｂが設けられている。また、絶縁部材開口１１ｂの周囲には筒状部１１ｃが設けられている。筒状部１１ｃは、絶縁部材本体部１１ａから第１電極体３ａ及び第２電極体３ｂ側に延びている。 The inner side insulating member 11 has an insulating member main body portion 11 a arranged along the battery inner surface of the sealing plate 2 . An insulating member opening 11b is provided in a portion of the insulating member main body portion 11a that faces the electrolyte injection hole 15 provided in the sealing plate 2 . A cylindrical portion 11c is provided around the insulating member opening 11b. The cylindrical portion 11c extends from the insulating member body portion 11a toward the first electrode body 3a and the second electrode body 3b.

［第１集電体と第２集電体の接続］
図８は、第１正極集電体６ａに第２正極集電体６ｂを取り付け、第１負極集電体８ａに第２負極集電体８ｂを取り付けた後の封口板２の電池内部側の面を示す図である。
第１正極タブ群４０ａ及び第２正極タブ群４０ｂが接続された第２正極集電体６ｂを、その一部が第１正極集電体６ａと重なるようにして、内部側絶縁部材１１上に配置する。そして、薄肉部６ｃにレーザー照射することにより、第２正極集電体６ｂと第１正極集電体６ａを接合する。これにより接合部６２が形成される。また、第１負極タブ群５０ａ及び第２負極タブ群５０ｂが接続された第２負極集電体８ｂを、その一部が第１負極集電体８ａと重なるようにして、内部側絶縁部材１３上に配置する。そして、薄肉部８ｃにレーザー照射することにより、第２負極集電体８ｂと第１負極集電体８ａを接合する。これにより接合部６３が形成される。 [Connection between first current collector and second current collector]
FIG. 8 shows the internal side of the battery of the sealing plate 2 after attaching the second positive electrode current collector 6b to the first positive electrode current collector 6a and attaching the second negative electrode current collector 8b to the first negative electrode current collector 8a. FIG. 4 is a diagram showing a surface;
The second positive electrode current collector 6b to which the first positive electrode tab group 40a and the second positive electrode tab group 40b are connected is partially overlapped with the first positive electrode current collector 6a, and placed on the inner insulating member 11. Deploy. Then, by irradiating the thin portion 6c with a laser beam, the second positive current collector 6b and the first positive current collector 6a are joined. A joint portion 62 is thus formed. Further, the second negative electrode current collector 8b to which the first negative electrode tab group 50a and the second negative electrode tab group 50b are connected is partially overlapped with the first negative electrode current collector 8a, and the inner side insulating member 13 is formed. place on top. Then, by irradiating the thin portion 8c with a laser, the second negative electrode current collector 8b and the first negative electrode current collector 8a are joined. A joint portion 63 is thus formed.

［角形二次電池の組み立て］
第１電極体３ａと第２電極体３ｂを一つに纏める。このとき、第１正極タブ群４０ａと第２正極タブ群４０ｂが異なる方向に湾曲し、第１負極タブ群５０ａと第２負極タブ群５０ｂが異なる方向に湾曲するようにする。そして、一つに纏めた第１電極体３ａと第２電極体３ｂを箱状ないし袋状に成形した絶縁シートからなる電極体ホルダー１４内に配置する。 [Assembly of prismatic secondary battery]
The first electrode body 3a and the second electrode body 3b are put together. At this time, the first positive electrode tab group 40a and the second positive electrode tab group 40b are curved in different directions, and the first negative electrode tab group 50a and the second negative electrode tab group 50b are curved in different directions. Then, the combined first electrode body 3a and second electrode body 3b are arranged in an electrode body holder 14 made of an insulating sheet formed into a box-like or bag-like shape.

電極体ホルダー１４で包まれた第１電極体３ａと第２電極体３ｂを角形外装体１に挿入する。そして、封口板２と角形外装体１を溶接し、角形外装体１の開口を封口板２により封口する。 The first electrode body 3 a and the second electrode body 3 b wrapped with the electrode body holder 14 are inserted into the rectangular exterior body 1 . Then, the sealing plate 2 and the rectangular outer body 1 are welded together, and the opening of the rectangular outer body 1 is sealed with the sealing plate 2 .

図９は、角形外装体１の開口を封口板２により封口した後の封口板２の短手方向に沿った電解液注液孔１５の近傍の断面図である。
図９に示すように、封口板２の短手方向において、第１正極タブ群４０ａと第２正極タブ群４０ｂの間に電解液注液孔１５が配置される。また、電解液注液孔１５と対向する位置に、第１テープ８０ａ及び第２テープ８０ｂが配置される。上述の通り、第１正極タブ群４０ａと第２正極タブ群４０ｂは異なる方向に湾曲している。 FIG. 9 is a cross-sectional view of the vicinity of the electrolytic solution pouring hole 15 along the lateral direction of the sealing plate 2 after the opening of the rectangular exterior body 1 is sealed with the sealing plate 2 .
As shown in FIG. 9, in the lateral direction of the sealing plate 2, the electrolyte injection hole 15 is arranged between the first positive electrode tab group 40a and the second positive electrode tab group 40b. A first tape 80 a and a second tape 80 b are arranged at positions facing the electrolyte injection hole 15 . As described above, the first positive electrode tab group 40a and the second positive electrode tab group 40b are curved in different directions.

封口板２に設けられた電解液注液孔１５から電池ケース１００内に電解液が注入される。電解液としては、例えば、有機溶媒に電解質塩を溶解させた非水電解液を用いることができる。封口板２に設けられた電解液注液孔１５から電池ケース１００内に注入された電解液は、絶縁部材開口１１ｂ、筒状部１１ｃ、集電体貫通穴６ｅを通過し、第１電極体３ａ及び第２電極体３ｂ側に移動する。
ここで、第１テープ８０ａが、第１電極体３ａにおいて第２電極体３ｂ側の最外面に位置する第１最外セパレータ９０ａと第１正極タブ群４０ａに跨って貼り付けられている。また、第２テープ８０ｂが、第２電極体３ｂにおいて第１電極体３ａ側の最外面に位置する第２最外セパレータ９０ｂと第２正極タブ群４０ｂに跨って貼り付けられている。したがって、注入された電解液により、第１最外セパレータ９０ａ、第２最外セパレータ９０ｂ、あるいは他のセパレータ９０が捲れることを防止できる。
したがって、第１最外セパレータ９０ａ、第２最外セパレータ９０ｂ、あるいは他のセパレータ９０が捲れることにより、意図しない部分で正極板４と負極板５が短絡することを防止できる。また、勢いよく注入された電解液により、正極活物質層４ｂないし負極活物質層５ｂの一部が脱落することを確実に防止できる。よって、脱落した正極活物質層４ｂないし負極活物質層５ｂに起因する短絡を防止できる。 Electrolyte is injected into the battery case 100 through an electrolyte injection hole 15 provided in the sealing plate 2 . As the electrolytic solution, for example, a non-aqueous electrolytic solution in which an electrolytic salt is dissolved in an organic solvent can be used. The electrolyte injected into the battery case 100 through the electrolyte injection hole 15 provided in the sealing plate 2 passes through the insulating member opening 11b, the cylindrical portion 11c, the current collector through-hole 6e, and the first electrode assembly. 3a and the second electrode body 3b.
Here, the first tape 80a is attached across the first outermost separator 90a located on the outermost surface of the first electrode body 3a on the side of the second electrode body 3b and the first positive electrode tab group 40a. A second tape 80b is attached across the second positive electrode tab group 40b and the second outermost separator 90b located on the outermost surface of the second electrode body 3b on the side of the first electrode body 3a. Therefore, it is possible to prevent the first outermost separator 90a, the second outermost separator 90b, or other separators 90 from being turned over by the injected electrolytic solution.
Therefore, it is possible to prevent the positive electrode plate 4 and the negative electrode plate 5 from being short-circuited at an unintended portion due to the first outermost separator 90a, the second outermost separator 90b, or another separator 90 being turned over. In addition, it is possible to reliably prevent part of the positive electrode active material layer 4b or the negative electrode active material layer 5b from dropping off due to the vigorously injected electrolytic solution. Therefore, it is possible to prevent a short circuit caused by the dropped positive electrode active material layer 4b or negative electrode active material layer 5b.

図５及び図８に示すように、第１テープ８０ａ及び第２テープ８０ｂの幅は、第１正極タブ群４０ａ及び第２正極タブ群４０ｂの幅よりも大きいことが好ましい。これにより、第１最外セパレータ９０ａ、第２最外セパレータ９０ｂ、あるいは他のセパレータ９０の捲れをより効果的に抑制できる。
なお、第１テープ８０ａ及び第２テープ８０ｂの幅を、第１正極タブ群４０ａ及び第２正極タブ群４０ｂの幅よりも小さくすることもできる。第１正極タブ群４０ａ及び第２正極タブ群４０ｂと正極端子７の間の導電経路に電流遮断機構を設ける場合は、第１テープ８０ａ及び第２テープ８０ｂの幅を、第１正極タブ群４０ａ及び第２正極タブ群４０ｂの幅よりも小さくすることで、第１テープ８０ａ及び第２テープ８０ｂが電流遮断機構に接触することを確実に防止できる。あるいは、第１テープ８０ａ及び第２テープ８０ｂの幅を第１正極タブ群４０ａ及び第２正極タブ群４０ｂの幅よりも小さくすることで、第１テープ８０ａ及び第２テープ８０ｂを貼り付ける際に第１テープ８０ａ及び第２テープ８０ｂが電流遮断機構に接触することがなく、第１テープ８０ａ及び第２テープ８０ｂを好ましい状態で貼り付けることができる。 As shown in FIGS. 5 and 8, the width of the first tape 80a and the second tape 80b is preferably greater than the width of the first positive electrode tab group 40a and the second positive electrode tab group 40b. As a result, curling of the first outermost separator 90a, the second outermost separator 90b, or other separators 90 can be more effectively suppressed.
The width of the first tape 80a and the second tape 80b can be made smaller than the width of the first positive electrode tab group 40a and the second positive electrode tab group 40b. When a current interrupting mechanism is provided in the conductive path between the first positive electrode tab group 40a and the second positive electrode tab group 40b and the positive electrode terminal 7, the width of the first tape 80a and the second tape 80b is set to the width of the first positive electrode tab group 40a. and the width of the second positive electrode tab group 40b, it is possible to reliably prevent the first tape 80a and the second tape 80b from coming into contact with the current interrupting mechanism. Alternatively, by making the width of the first tape 80a and the second tape 80b smaller than the width of the first positive electrode tab group 40a and the second positive electrode tab group 40b, when attaching the first tape 80a and the second tape 80b The first tape 80a and the second tape 80b do not come into contact with the current interrupting mechanism, and the first tape 80a and the second tape 80b can be attached in a preferable state.

第１テープ８０ａ及び第２テープ８０ｂの少なくとも一方の長さを長くし、第１テープ８０ａ及び第２テープ８０ｂの少なくとも一方が、少なくとも一方の接合部６０を覆うようにすることもできる。接合部６０が第１テープ８０ａ及び第２テープ８０ｂの少なくとも一方で覆われていると、接合部６０に金属粉等の異物が付着していることがあっても、金属粉等が電極体３内に侵入することを抑制できる。 At least one of the first tape 80a and the second tape 80b may be lengthened so that at least one of the first tape 80a and the second tape 80b covers at least one joint 60. FIG. When the joint portion 60 is covered with at least one of the first tape 80 a and the second tape 80 b, even if foreign matter such as metal powder adheres to the joint portion 60 , the metal powder or the like does not reach the electrode body 3 . You can prevent it from getting inside.

なお、筒状部１１ｃは、集電体貫通穴６ｅを貫通していることが好ましい。筒状部１１ｃの第１電極体３ａ及び第２電極体３ｂ側の端部（図９においては下端部）は、第２正極集電体６ｂ上に積層された第１正極タブ群４０ａの第１電極体３ａ及び第２電極体３ｂ側の面よりも、第１電極体３ａ及び第２電極体３ｂ側（図９においては下方）に位置することが好ましい。筒状部１１ｃの第１電極体３ａ及び第２電極体３ｂ側の端部（図９においては下端部）は、第２正極集電体６ｂ上に積層された第２正極タブ群４０ｂの第１電極体３ａ及び第２電極体３ｂ側の面よりも、第１電極体３ａ及び第２電極体３ｂ側（図９においては下方）に位置することが好ましい。 In addition, it is preferable that the cylindrical portion 11c penetrates the current collector through-hole 6e. The end (the lower end in FIG. 9) of the cylindrical portion 11c on the side of the first electrode body 3a and the second electrode body 3b is the first electrode tab group 40a laminated on the second positive electrode current collector 6b. It is preferably located on the side of the first electrode body 3a and the second electrode body 3b (lower in FIG. 9) than the surface on the side of the first electrode body 3a and the second electrode body 3b. The end (lower end in FIG. 9) of the tubular portion 11c on the side of the first electrode body 3a and the second electrode body 3b is the second electrode tab group 40b of the second positive electrode tab group 40b laminated on the second positive electrode current collector 6b. It is preferably located on the side of the first electrode body 3a and the second electrode body 3b (lower in FIG. 9) than the surface on the side of the first electrode body 3a and the second electrode body 3b.

封口板２に設けられた電解液注液孔１５から電池ケース１００内に電解液が注入された後、電解液注液孔１５はブラインドリベット等の封止部材１６により封止される。 After the electrolyte is injected into the battery case 100 through the electrolyte injection hole 15 provided in the sealing plate 2, the electrolyte injection hole 15 is sealed with a sealing member 16 such as a blind rivet.

［テープ］
第１テープ８０ａ、第２テープ８０ｂ等のテープは、基材層と、基材層上に形成された接着層からなることが好ましい。基材層は、樹脂からなることが好ましい。基材層は、ポリプロピレン、ポリイミド、ポリフェニレンサルファイド、ポリエチレン、ポリエステル、ポリエチレンナフタレート等から選択される部材あるいはそれらの混合物であることが好ましい。特に基材層はポリプロピレンからなることが好ましい。
接着層は、常温（２５℃）で粘着性を有することが好ましい。また、熱溶着可能なものであってもよい。接着層は、ゴム系の接着剤、アクリル系、ポリエチレン系等から選択される部材あるいはそれらの混合物であることが好ましい。特に接着層はゴム系の接着剤であることが好ましい。 なお、テープが、熱溶着性のシートであってもよい。この場合、熱溶着によりテープを接着する。また、テープはガラスクロステープであってもよい。 [tape]
Tapes such as the first tape 80a and the second tape 80b are preferably composed of a base layer and an adhesive layer formed on the base layer. The substrate layer is preferably made of resin. The base material layer is preferably a member selected from polypropylene, polyimide, polyphenylene sulfide, polyethylene, polyester, polyethylene naphthalate, etc., or a mixture thereof. In particular, the substrate layer is preferably made of polypropylene.
The adhesive layer preferably has adhesiveness at normal temperature (25° C.). Also, it may be heat-sealable. The adhesive layer is preferably a member selected from rubber-based adhesives, acrylic adhesives, polyethylene-based adhesives, etc., or a mixture thereof. In particular, the adhesive layer is preferably a rubber-based adhesive. Note that the tape may be a heat-fusible sheet. In this case, the tape is adhered by heat welding. Alternatively, the tape may be a glass cloth tape.

テープの厚みは特に限定されないが、例えば、１０μｍ～５００μｍとすることができる。 Although the thickness of the tape is not particularly limited, it can be, for example, 10 μm to 500 μm.

テープがタブ群と絶縁シートに跨って貼り付けられるタイミングは、電解液注液孔から電解液が電池ケース内に注入される前であれば特に限定されない。タブ群を集電体に接続する前であってもよいし、タブ群を集電体に接続した後であってもよい。 The timing at which the tape is attached across the tab group and the insulating sheet is not particularly limited as long as it is before the electrolyte is injected into the battery case from the electrolyte injection hole. It may be before connecting the tab group to the current collector or after connecting the tab group to the current collector.

［絶縁シート］
電極体の最外面に配置される絶縁シートは、正極板と負極板の間に配置されるセパレータと同じ材質のものとすることができる。なお、電極体の最外面にセパレータとは異なる絶縁シートを配置してもよい。絶縁シートは非多孔質であってもよいが、電極体内に電解液が染み込みやすいように絶縁シートは多孔質であることが好ましい。
セパレータが九十九折状とされる場合は、セパレータの一方端部が電極体の最外周に巻かれた状態とすることができる。そして、電極体の最外周に位置するセパレータを絶縁シートとすることができる。なお、九十九折状とされたセパレータとは別部材の絶縁シートを、電極体の最外周に巻きつけてもよい。
巻回型の電極体の場合、正極板と負極板の間に配置される帯状のセパレータが電極体の最外周に巻かれた状態とすることができる。そして、最外周に位置するセパレータを絶縁シートとすることができる。なお、帯状のセパレータとは別部材の絶縁シートを電極体の最外周に巻きつけてもよい。 [Insulating sheet]
The insulating sheet arranged on the outermost surface of the electrode body can be made of the same material as the separator arranged between the positive electrode plate and the negative electrode plate. An insulating sheet different from the separator may be arranged on the outermost surface of the electrode assembly. Although the insulating sheet may be non-porous, it is preferred that the insulating sheet be porous so that the electrolytic solution can easily penetrate into the electrode body.
When the separator is folded in half, one end of the separator can be wrapped around the outermost circumference of the electrode assembly. Then, the separator positioned at the outermost periphery of the electrode assembly can be made into an insulating sheet. In addition, an insulating sheet, which is a member different from the folded separator, may be wound around the outermost periphery of the electrode body.
In the case of the wound electrode body, a strip-shaped separator disposed between the positive electrode plate and the negative electrode plate can be wound around the outermost periphery of the electrode body. Then, the outermost separator can be used as an insulating sheet. An insulating sheet, which is a separate member from the strip-shaped separator, may be wound around the outermost periphery of the electrode assembly.

上述の実施形態においては封口板に設けられた電解液注液孔と対向する位置に正極タブ群が配置された例を示したが、電解液注液孔と対向する位置に負極タブ群が配置されるようにしてもよい。 In the above-described embodiment, the positive electrode tab group is arranged at a position facing the electrolyte injection hole provided in the sealing plate, but the negative electrode tab group is arranged at a position facing the electrolyte injection hole. may be made.

上述の実施形態においては、第１電極体３ａ及び第２電極体３ｂが積層型の電極体である例を示したが、第１電極体３ａ及び第２電極体３ｂは、それぞれ、巻回型の電極体としてもよい。第１電極体３ａ及び第２電極体３ｂをそれぞれ巻回型の電極体とする場合、第１電極体３ａ及び第２電極体３ｂのそれぞれの封口板２側の端部に、正極タブ群及び負極タブ群が形成されるようにする。 In the above-described embodiment, the first electrode body 3a and the second electrode body 3b are laminated electrode bodies. may be used as an electrode body. When each of the first electrode body 3a and the second electrode body 3b is a wound electrode body, a group of positive electrode tabs and a A negative electrode tab group is formed.

上述の実施形態においては、正極集電体及び負極集電体がそれぞれ二つの部品からなる例を示したが、正極集電体及び負極集電体はそれぞれ一つの部品から構成されてもよい。正極集電体と負極集電体がそれぞれ一つの部品である場合、正極集電体と負極集電体にそれぞれ正極タブ群と負極タブ群を接続した後、正極集電体と負極集電体を封口板に取り付けられた正極端子と負極端子にそれぞれ接続することが好ましい。 Although the positive electrode current collector and the negative electrode current collector each consist of two parts in the above-described embodiments, the positive electrode current collector and the negative electrode current collector may each consist of one part. When the positive electrode current collector and the negative electrode current collector are respectively one component, after connecting the positive electrode current collector and the negative electrode current collector to the positive electrode current collector and the negative electrode current collector, respectively, the positive electrode current collector and the negative electrode current collector are connected. are preferably connected to the positive terminal and the negative terminal attached to the sealing plate, respectively.

偏平状の電極体を平面視したとき、テープが正極活物質層と重ならないように、テープを電極体の最外面に位置する絶縁シートに貼り付けることができる。このような場合、電極体に局所的に大きな圧力が加わることを抑制できる。 The tape can be attached to the insulating sheet located on the outermost surface of the electrode body so that the tape does not overlap the positive electrode active material layer when the flat electrode body is viewed from above. In such a case, it is possible to suppress local application of large pressure to the electrode body.

正極板、負極板、セパレータ、及び電解質等に関しては、公知の材料を用いることができる。 Known materials can be used for the positive electrode plate, the negative electrode plate, the separator, the electrolyte, and the like.

２０・・・角形二次電池
１００・・・電池ケース
１・・・角形外装体
２・・・封口板
２ａ・・・正極端子挿入孔
２ｂ・・・負極端子挿入孔
３・・・電極体
３ａ・・・第１電極体
３ｂ・・・第２電極体
４・・・正極板
４ａ・・・正極芯体
４ｂ・・・正極活物質層
４ｃ・・・正極保護層
４ｄ・・・正極タブ
４０・・・正極タブ群
４０ａ・・・第１正極タブ群
４０ｂ・・・第２正極タブ群
５・・・負極板
５ａ・・・負極芯体
５ｂ・・・負極活物質層
５ｃ・・・負極タブ
５０・・・負極タブ群
５０ａ・・・第１負極タブ群
５０ｂ・・・第２負極タブ群
６・・・正極集電体
６ａ・・・第１正極集電体
６ｂ・・・第２正極集電体
６ｃ・・・薄肉部
６ｄ・・・集電体開口
６ｅ・・・集電体貫通穴

７・・・正極端子

８・・・負極集電体
８ａ・・・第１負極集電体
８ｂ・・・第２負極集電体
８ｃ・・・薄肉部
８ｄ・・・集電体開口

９・・・負極端子

１０・・・外部側絶縁部材
１１・・・内部側絶縁部材
１１ａ・・・絶縁部材本体部
１１ｂ・・・絶縁部材開口
１１ｃ・・・筒状部

１２・・・外部側絶縁部材
１３・・・内部側絶縁部材

１４・・・電極体ホルダー
１５・・・電解液注液孔
１６・・・封止部材
１７・・・ガス排出弁

６０、６１、６２、６３・・・接合部

９０・・・セパレータ
９０ａ・・・第１最外セパレータ
９０ｂ・・・第２最外セパレータ

８０ａ・・・第１テープ
８０ｂ・・・第２テープ
20 Rectangular secondary battery 100 Battery case 1 Rectangular exterior body 2 Sealing plate 2a Positive electrode terminal insertion hole 2b Negative electrode terminal insertion hole 3 Electrode body 3a First electrode body 3b Second electrode body 4 Positive electrode plate 4a Positive electrode core 4b Positive electrode active material layer 4c Positive electrode protective layer 4d Positive electrode tab 40 Positive electrode tab group 40a First positive electrode tab group 40b Second positive electrode tab group 5 Negative electrode plate 5a Negative electrode core 5b Negative electrode active material layer 5c Negative electrode Tab 50... negative electrode tab group 50a... first negative electrode tab group 50b... second negative electrode tab group 6... positive electrode current collector 6a... first positive electrode current collector 6b... second Positive electrode current collector 6c Thin portion 6d Current collector opening 6e Current collector through-hole

7 ... positive electrode terminal

8 Negative electrode current collector 8a First negative electrode current collector 8b Second negative electrode current collector 8c Thin portion 8d Current collector opening

9 Negative electrode terminal

DESCRIPTION OF SYMBOLS 10... External side insulating member 11... Internal side insulating member 11a... Insulating member main-body part 11b... Insulating member opening 11c... Cylindrical part

12 External side insulating member 13 Internal side insulating member

14... Electrode body holder 15... Electrolyte injection hole 16... Sealing member 17... Gas discharge valve

60, 61, 62, 63 ... joints

90 Separator 90a First outermost separator 90b Second outermost separator

80a... First tape 80b... Second tape

Claims (5)

正極板と負極板を含む第１電極体と、
正極板と負極板を含む第２電極体と、
開口を有し、前記第１電極体と前記第２電極体を収容する外装体と、
前記開口を封口するとともに長手方向とこの長手方向と垂直な短手方向を有する封口板と、
前記第１電極体及び前記第２電極体よりも前記封口板側に配置された集電体と、
前記集電体に電気的に接続され、前記封口板に取り付けられた端子と、を備える二次電池であって、
前記封口板は電解液注液孔を有し、
前記短手方向において、前記第１電極体と前記第２電極体とが並び、
前記第１電極体は前記第２電極体側の最外面に絶縁シートを有し、
前記第１電極体は、前記封口板側の端部に、前記正極板又は前記負極板に電気的に接続された第１電極タブ群を有し、
前記第２電極体は、前記封口板側の端部に、前記正極板又は前記負極板に電気的に接続された第２電極タブ群を有し、
前記第１電極タブ群と前記第２電極タブ群は、前記集電体に接続され、
前記絶縁シートにテープが貼り付けられており、
前記テープは、前記絶縁シートに貼り付いた第１部分と、前記第１部分に接続し、前記短手方向において、前記第２電極体から離れる方向に延びる第２部分とを含み、
前記電解液注液孔と対向する位置に、前記テープが配置され、
前記電解液注液孔は封止部材により封止された、
二次電池。 a first electrode body including a positive plate and a negative plate;
a second electrode body including a positive plate and a negative plate;
an exterior body having an opening and accommodating the first electrode body and the second electrode body;
a sealing plate that seals the opening and has a longitudinal direction and a lateral direction perpendicular to the longitudinal direction;
a current collector disposed closer to the sealing plate than the first electrode body and the second electrode body;
a terminal electrically connected to the current collector and attached to the sealing plate,
The sealing plate has an electrolyte injection hole,
The first electrode body and the second electrode body are arranged in the lateral direction,
The first electrode body has an insulating sheet on the outermost surface on the second electrode body side,
The first electrode body has a first electrode tab group electrically connected to the positive electrode plate or the negative electrode plate at the end on the sealing plate side,
The second electrode body has a second electrode tab group electrically connected to the positive electrode plate or the negative electrode plate at the end on the sealing plate side,
The first electrode tab group and the second electrode tab group are connected to the current collector,
A tape is attached to the insulating sheet,
The tape includes a first portion attached to the insulating sheet and a second portion connected to the first portion and extending in the lateral direction away from the second electrode body,
The tape is arranged at a position facing the electrolyte injection hole,
The electrolyte injection hole is sealed with a sealing member,
secondary battery. 前記絶縁シートは、多孔質のシートである請求項１に記載の二次電池。 The secondary battery according to claim 1, wherein the insulating sheet is a porous sheet. 前記第１電極体は、複数の前記正極板と、複数の前記負極板を含む積層型の電極体であり、
前記第２電極体は、複数の前記正極板と、複数の前記負極板を含む積層型の電極体である請求項１又は請求項２に記載の二次電池。 The first electrode body is a laminated electrode body including a plurality of the positive electrode plates and a plurality of the negative electrode plates,
3. The secondary battery according to claim 1, wherein the second electrode body is a laminated electrode body including a plurality of the positive electrode plates and a plurality of the negative electrode plates. 前記封口板の電池内部側には絶縁部材が配置されており、
前記絶縁部材は、前記電解液注液孔と対向する位置に絶縁部材開口を有し、
前記絶縁部材開口の周囲には筒状部が形成された請求項１～３のいずれかに記載の二次電池。 An insulating member is arranged on the inner side of the battery of the sealing plate,
The insulating member has an insulating member opening at a position facing the electrolyte injection hole,
4. The secondary battery according to any one of claims 1 to 3, wherein a tubular portion is formed around the insulating member opening. 前記集電体は、前記電解液注液孔と対向する位置に集電体貫通穴を有する請求項１～４のいずれかに記載の二次電池。
The secondary battery according to any one of claims 1 to 4, wherein the current collector has a current collector through-hole at a position facing the electrolyte injection hole.
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